A popular fantasy role-playing video game co-published by Take-Two Interactive Software had its rating toughened due to excessive gore and the discovery that female characters could appear topless, the industry’s content-ratings body said on Wednesday.

The Entertainment Software Rating Board changed its rating on “The Elder Scrolls IV: Oblivion” to “mature” from “teen.” A “mature” rating advises the content is unsuitable for those under 17.

The ESRB said it found an art file in the PC version of “The Elder Scrolls IV: Oblivion,” made by Bethesda Softworks, the game’s other co-publisher. A mod from a third party allows players to change settings in the art file to make female characters appear topless.

Publisher Take Two suffered a similar fate after the “Hot Coffee” mod for Grand Theft Auto: San Andreas tipped up that allowed players to bang hoes like there’s no tomorrow. The game-maker was responsible for that mod and its not yet entirely clear where the latest one came from.